Improvement in cibcdlae-sawing machines



@uiten gratta gamut @Hita DAYTON e.. CANFIELD, or NIAGARA rALLsNEW YORK.Laim Patent No. 66,947, dated .my 23,1867'.

IMPROVEMENT IN CIRCULAR-SAWING MACHINES.

@In sduit-ult taunt tu in tlgtst litttrs ateut uit multim-g um nttlgtzum.

T0 ALL WHOM IT MAY CONCERN:

'Be it known that I, DAYTON Gr.' CANRIELD, of Niagara Falls, in thecounty of Niagara, und State of New York, -have invented a new andimproved Pivot-Frame for Adjusting the Lead of Circular Saws; and I dohereby declare that the following is a full and exact descriptionthereof, reference being had to the accompanying drawings, making partof this speciication, in which- I Figure 1 is a plan of my improvements.

Figure 2 is a fragmentary view in section showing the manner of pivotingthe frame.

Figure 3 is a 'detached section of the'adjusting device in plane of linea: fig. 1.

Figure 4 is a view of the self-adjusting nut K.

Like letters of reference designate corresponding parts in all thefigures.

In sawing lumber with a circularsaw it becomes necessary to frequentlychange the adjustment or lead of the saw toadapt it to different kindsof timber, the softer and more yielding varieties pressing the hardestagainst the saw, and requiring the greatest lead or adjustment towardsthe timber. Hitherto this has been eifected by adjusting the boxes ofthe saw-mandrel by means of set-screws and by changing the saw-guide;and it is onel of the most diiicult and annoying things that asawyer hasto contend with, requiring not unfrequently hours to make the precisechange required. As the saw has to be at rest while this adjustment ismade it i involves a great loss, resulting from the stopping of themill, and from the employees remaining idle during the process.

It is the object of my invention to obviate these diiculties and preventthis loss by a method of adjustment which consists in pivoting the framewhich supports the saw-mandrel so that the saw can be readily adjustedat anytime, even while in motion, by simply turning a screw at onecorner `of lthe frame, and which elects the required change by slightlyturning the frame on its pivot, all as hereinafter fully setforth.

Y In the drawings, A representen rectangular frame, B, the shaft orsaw-mandrel mounted near one end; C, the saw; d, the sawguide, and E thedriving-belt. This frame is pivoted in any suitablemanner to a base, F,of similar form, at a point as near the centre of the saw as possible,being shown in the drawings as pivoted by means of a bolt, y, having itshead countersunkbeneath the box of the .mandrel and extending downwardthough the frame,- base, and floor,- land provided with a nut, L, andwasher at its lower end, (iig. 2.) By turning the frame thus pivoted itis evidentthat the saw mounted on the end of mandrel B will be adjustedaccordingly to a greater or less lead, owing to the direction in whichit is turned. For. this purpose I prefer to employ at the cornerdiagonally opposite a screw-bolt7 I, which passes through any suitablebearing piece, J, firmly bolted to the oor, and screws into aself-adjusting nut, K, mounted in two eye-bolts, ll, which secure ittothe end of the frame, as represented in figs. l aud-3. The bolt I,where it passes through the bearing J, is provided with an annulargroove, m, iig. 3, in which iitstheend of a small pin, o, inserted inthe bearing from the top, that Aallows the screw to freely turn, butprevents any longitudinal movement. It is` obvious that by simplyturning this bolt the-end of the frame will be swung around, therebyadjusting the lead of the saw :is required, as shown in red lines. Thenut K having its bearings in the two eye-bolts ZZ,-readi1y adjustsitself` therein as the frame is moved, so as to always maintain the samerelative position to the screw I, which thereby insures the easytraverse ofthe latter through it. When the frame and saw have beenproperly adjusted a wedge, p, orequivalent, may be inserted in asuitable recess formed in the' top of frame F in such a manner as towedge against-the'end of' the frame A, as shown in figs. 1 and 3, andhold it firmly, relieving the screw-threads of the strain produced bythe traction of the belt and vibration of the running.

I do not confine myself to the above-described means for adjnsting'theend ofthe frame A, as other devices may be employed to accomplish thesame purpose. i

It is evident from the aforegoing description that the saw can bereadjusted even while in motion by giving the bolt I n. turn in eitherdirection, as may .be required. The entire adjustment being effectedbythe single screw-bolt enables the saw to be adjusted with aprecisionthat cannot be attained by the ordinary method, cxceptafter repeatedtrials, whereas by the use ,of niyiimprovement after the saw has beenset in motion, if the adjustment is found to be incorrect it canbechanged while in motion and the proper lead attained much more readilythan when the saw is still. I It also saves the necessity of changingthe saw-guide d with every .adjustment ofthe saw, as, from being fixedto the fram'e,it moves with it and always occupies the same relativeposition to the-saw.

My improvement not only saves the delay of stopping the mill andthe lossresulting from the hands remaining idle during the usual tediousoperation of changing the adjustment, but also enables eheaperboxes tobe employed for the mandrel, as well as saving the cost of theset-serews and their attachments that would otherwise be required. l

I am aware that saws have been made adjustable by means of swingingframes operated by screws working-through an arm on the movable frameand engaging with a rigid nut immovably fixed to some bearing; and alsothat the adjustment has, in other instances, been eifeotecl by cams andlevers, and these I do not claim, as `my invention consists in theemployment with a movable mandrel-frame otl an adjusting-screw operatingin a fixed collar or bearing through a swivel-nut which accommodatesitselfV to the varying positions of the 'frame without strain or bindingupon any ofA the operative parts.

What I claim as my invention, and desire to secure by Letters Patent,is-

The combination of the adjustable mandrel-frame A, sorewbolt I,swivel-nut K, and bearing J, constructed, arranged, and operatingsubstantially asl and for the purposes set forth.

In witness whereof I have hereunto signed my name in-the presence of twosubscribing witnesses.

DAYTON G.' GANFIELD.

Witnesses:

JAY HYATT, ALBERT HAIGHT.

